Preview/Quick test: 9 BASEN Li-Ion batteries (IMR and NCR) - FINISHED

Wow, this is a big sample pack. Happy testing :)

Someone's hobby charger is going to be very busy!

Please test internal resistance and max current draw :slight_smile: thanks

Internal resistance can be tested with a hobby charger, but it should only be used as a frame of reference. It needs to be compared to other cells, ideally with the same hobby charger. HKJ's method of measuring internal resistance is much better. Max current draw is another issue, either requiring involving a big lead acid battery for regenerative discharge or resistors, and I believe the results are +/- 20%. Another problem is that 35A cell. My charger only claims to work up to 20A with regenerative discharge.

Sirius can you be serious :wink: ! Testing high current drains is not an easy task and impossible with proper equipment. None that I know on BLF except HKJ (to some extent) has that equipment. You can see the topic - it says Preview and Quck test. AFAIK HKJ needs few days up to one week to test 1 pair of batteries. :open_mouth:

A few days is not enough, usual I say a week. The actual time varies with the cell capacity and number of currents and voltages I test. A 4.35V takes about 3 week, because it gets 3 runs.

It will be some time before I get around to the Basen cells, ledoman will probably be finished with his tests before I begin.

Yes I thought so it is a week, but hoping it can be less too. It is very, very time consuming job.
There is also Leafty who is going to test in parallel his batch, but in more diverse manner regarding discharge currents. Also time consuming :~

Yes, low current 14440 and 16340 is faster to test. I have not kept track of days to test them, but it is probably 4 days.

Generally I do not really do much on the testing stations. I have a pile of batteries to test besides the station and then I simply put the next one in when it is finished.

Later on I will fetch the test data and write the review. This can be weeks later, or months (I have a few alkaline tests that old).

I'll try to follow HKJ's lead as much as possible. I have little interest in separately testing and calculating internal resistance, and I probably won't test each cell more than once at the same current unless I have free time after doing everything once, and I have little confidence in the calibration of my equipment compared to HKJ with his skills and equipment, so I'll be very interested in seeing how my results compare. They won't be directly comparable though since one of my chargers only goes does to 3.0V, but there's only a small handful of mA between there at 2.8V anyway. There are also certain things I still need to do to prepare for high current testing, and I didn't have equipment to fully charge 4.35V cells either. Basically that means the high current and high voltage cell will have parts of their reviews that may not be finished for a couple weeks.

I may be able to post full results for the 3200mAh cell on Friday, and almost certainly by Saturday. The lower current cells may actually take me longer since there's more tests and I'm charging everything at 0.5A in order to keep things simple and prevent mistakes. Unless I missed something on the data sheets, that current will allow maximum charge.

Very glad to know that you have received batteries, and look forward to your wonderful test results :slight_smile:

Hmmm,

so, you don’t have

- charger that can charge up to 4.35V

- dis/charger that can discharge below 3V

- way to discharge with 1+A

- way to test internal resistance (indicates how good unknown cell is)

- experience

  • time!!!

That’s exactly why I avoid testing batteries…

Do you have usb ttl uart for your hobby charger? it would make the job so much easier…

Who you are taking to? If it’s me, read the OP :wink: .

That does not make the test invalid, they will still be useful.

When reading the test it is, of course, important to know the limitations. As a extreme: A sub-ohmic vapor will not be able to use the results.

Oh, ok, discharging at 5A sounds interesting :slight_smile:

Basen IMR 18350 at 1A - 876mAh

Basen IMR 18500 at 2A - 1151mAh

Basen IMR 18650 at 2A –> 1509mAh

Basen IMR 18490 at 2A - 1097mAh

Cool! That is a helluva lot of batteries! happy testing and thank you for the results :-)

Basen IMR 18650 (2100) at 2A - 2033mAh